Other Comprehensive Income (Loss), Reclassification out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gains (losses) on equity investments, net	$ 643	$ 252
Income before taxes	5,011	3,815
Cost of sales	(6,335)	(5,636)
Research and development	(3,311)	(3,311)
Marketing, general and administrative	(1,900)	(2,099)
Interest and other, net	(81)	1
Amounts reclassified out of accumulated other comprehensive income (loss)	9	240
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	122
Unrealized holding gains (losses) on available-for-sale investments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified out of accumulated other comprehensive income (loss)	0
Unrealized holding gains (losses) on available-for-sale investments [Member] | Reclassified out of Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gains (losses) on equity investments, net	0	263
Income before taxes	0	263
Unrealized holding gains (losses) on derivatives [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified out of accumulated other comprehensive income (loss)	53
Unrealized holding gains (losses) on derivatives [Member] | Reclassified out of Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before taxes	53	1
Unrealized holding gains (losses) on derivatives [Member] | Reclassified out of Accumulated Other Comprehensive Income (Loss) [Member] | Foreign currency contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gains (losses) on equity investments, net	0	4
Cost of sales	8	(20)
Research and development	41	(16)
Marketing, general and administrative	14	(5)
Interest and other, net	(10)	38
Actuarial gains (losses) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified out of accumulated other comprehensive income (loss)	(45)	(24)
Amortization of pension and postretirement benefit components [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified out of accumulated other comprehensive income (loss)	(45)	(24)
Foreign currency translation adjustment [Member] | Reclassified out of Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest and other, net	$ 1	$ 0